582 Anxals of the Carnegie Museum. 



In this epoch-making article the Chazy is discussed very briefly as fol- 

 lows : 



" In New York the Black River limestone includes the Chazy and birds- 

 eye limestones. Some forms are peculiar to this formation, such as Lituiies 

 and Madurites.*^ The trilobites, as yet not numerous, are represented by 

 the genera Illamis and Isotelus ; the Orthoceratites by Ormocfias and 

 Endoceras. The brachiopods are represented by the genera Ort/iis, Lep- 

 tiTtia and Terebratulay 



1850. d'ORBlGNY, Al.CiDE. Prodrome de Paleonlologie, Tome i. 

 Lists of the fossils of the Chazy limestone, following Hall. 



1852. Hunt, T. S. Examinations of Phosphatic Matters, Supposed Bones, and 

 Coprolites, Occurring in the Lower Silurian Rocks of Canada. (Quarterly 

 Journal of the Geological Society of London, Vol. 8, p. 209. 



Among other things analyzed was a concretion from the Chazy limestone 

 at Hawkesbury. The results were as follows : 



Phosphate of lime 44-70 



Carbonate of lime 6.60 



Carbonate of magnesia 4-76 



Oxide of iron 8. 60 



Insoluble siliceous matter 27.90 



Volatile matter 5.00 



97.66 



1852. Logan, Sir W. E. On the Footprints Occurring in the Potsdam Sandstone 

 of Canada. Quarterly Journal of the Oeological Society of London, Vol. 

 8, p. 200. 



In discussing the strati graphic position of the Potsdam sandstone, the 

 author gives a section from Isle Jesus to the St. Louis River, showing the 

 geological formations from the gneiss to the Utica slate, and lists a few fos- 

 sils from the Chazy. A geological map which shows well the formations 

 in the Ottawa basin is appended. 



1855. Emmons, Ebenezer. American Geology. In this work Emmons .still re- 

 tains a part of the Chazy formation in the Calciferous. The following sec- 

 tion at Chazy is given : 



1. Silico-calcareous beds, more or less interspersed with sparry masses, 

 thirty to thirty-five feet ; fossils rare and more or less cherty. 



2. Crinoidal mass composed almost entirely of disjointed and broken col- 

 umns of encrinites in which plates of the cistidea may be recognized, 

 twenty feet. 



3. A dull, gray, earthy mass, ten feet, without fossils, and passing into 

 oolitic beds. 



4. Another crinoidal mass similar to the first, though its color is a brighter 

 red. 



♦"Note the spelling adopted by de Verneuil. 



